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 Post subject: I’ve got smoke!
PostPosted: Mon May 10, 2021 6:46 pm 
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Joined: Wed Jul 29, 2020 11:22 am
Posts: 8
Fired up my Plexi build and got a puff of smoke from the 5 watt 1k5 across the standup cap. It’s done for! Hopefully I can track down a replacement locally in the next few days.

The only thing I noticed on a brief once over is I missed the cap on the standby switch (it’s very small on the layout).

UPDATE: Double checking everything I found my connections on the terminal strip for the 470R’s to the 6v6’s were on the middle post which connects to ground. :oops:

Really hoping I didn’t fry something else in the process.

(The photo below has the 1k5 resistor removed and I installed the cap I missed on the standby switch)


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 Post subject: Re: I’ve got smoke!
PostPosted: Tue May 11, 2021 8:46 am 
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Friend
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Joined: Fri Mar 18, 2011 5:53 pm
Posts: 30
Yes, connecting to the ground lug of the terminal strip is an issue. Your orange wire is connecting about 370 VDC straight to ground. If you are lucky, that resistor burning up may have prevented damage to other components.

Can you measure your cap can? I would carefully go back over every single connection on the layout/schematic and mark to confirm that each is correct before you power up again.

I would also recommend you build a light bulb limiter. That would have told you something was wrong right away and likely prevented damage to the amp.

Good luck!

-Dan


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 Post subject: Re: I’ve got smoke!
PostPosted: Tue May 11, 2021 9:36 am 
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Joined: Wed Jul 29, 2020 11:22 am
Posts: 8
Yeah, I’ve gone through everything again. Both sides of the cap check out. The terminal strip mishap seems to be the only issue.


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 Post subject: Re: I’ve got smoke!
PostPosted: Tue May 11, 2021 2:35 pm 
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Joined: Wed Jul 29, 2020 11:22 am
Posts: 8
Found a replacement resistor locally and everything checks out! Putting it through its initial paces now.


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 Post subject: Re: I’ve got smoke!
PostPosted: Thu May 13, 2021 6:46 am 
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Joined: Fri Mar 18, 2011 5:53 pm
Posts: 30
How'd it go?


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 Post subject: Re: I’ve got smoke!
PostPosted: Thu May 13, 2021 8:41 am 
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Joined: Wed Jul 29, 2020 11:22 am
Posts: 8
Great! No issues and it sounds fantastic. Really loving the variety of tones.

I’m working on a video with a demo and documenting the process similar to my 5e3 videos. Found here: https://youtube.com/playlist?list=PLf7y ... 1r7qIiJbc6


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 Post subject: Re: I’ve got smoke!
PostPosted: Sun May 16, 2021 11:30 am 
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Joined: Fri Mar 18, 2011 5:53 pm
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That's great! Excited to hear the demo.

-Dan


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 Post subject: Re: I’ve got smoke!
PostPosted: Sun May 23, 2021 9:20 am 
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Holy Ghost
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Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7484
Location: Brighton, Canada
It’s rare but not an uncommon mistake. Glad to hear it worked out. Looking forward to the video?

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps


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